Wednesday, July 21, 2010

It's been awhile since the Minnesota Governors race was polled, SurveyUSA released the last poll on the race over a month ago, so we haven't been able to update the GPI recently. Before we get to that let's just take a quick look at the results of the Rasmussen poll.

All three DFL candidates polled better this time than last time Rasmussen polled this race, by margins of 3 to 5 points while Emmer and Horner polled slightly worse, by margins of 1 to 2 points. These are the same trend lines that SurveyUSA caught in their now month old poll, Emmer slipping and the three DFL candidates gaining. It's not hard to see how these trends will only be magnified after the DFL primary in August.

Now onto the GPI update. Just a reminder on the methodology:

The weighted average is an average of all the polls, weighted against a variable called "weight". This variable represents a combination of the Pollster Rating and the age of the poll. The newer the poll and better the pollster the higher it will be weighted. The age of the poll has more effect on the weight then the pollster rating, with the age making up 75% of the weight and the Pollster Rating making up 25%. However the age weighting will essentially fall off at 50 days and this will get adjusted as we get closer to the race in question.

There are only two polls that meet the 50 day shelf life criteria right now, the just released Rasmussen poll and the June SurveyUSA poll, so the GPI is simply a weighted average of the two polls. The only recent poll on the DFL primary is the SuveyUSA poll, so there will be no update to the primary GPI right now.

Here's the current GPI poll list:

And now the actual GPI:

All of the DFL candidates increased their wAve by about 3 points while Emmer held steady and Horner dropped a couple. The trend lines certainly look good for the DFL going forward.